Which of the following is not a property of aluminium ?

Options

A. Good conductor of heat and electricity.
B. It is malleable.
C. It is heavy.
D. It is ductile.

Explanation

To determine which of the following is not a property of aluminium, we will analyze each option provided:

1. **Good conductor of heat and electricity**: Aluminium is known for its excellent conductivity. It is widely used in electrical wiring and heat exchangers due to this property. Therefore, this statement is true.

2. **Malleable**: Aluminium is indeed malleable, meaning it can be hammered or rolled into thin sheets without breaking. This property allows it to be used in various applications, such as foil and packaging. Thus, this statement is also true.

3. **Heavy**: Aluminium is actually a lightweight metal. Its density is about 2.7 grams per cubic centimeter, which is relatively low compared to many other metals. Therefore, this statement is false.

4. **Ductile**: Aluminium is ductile, which means it can be drawn into wires. This property makes it suitable for electrical applications. Hence, this statement is true as well.

After analyzing the properties, we conclude that the statement "C. Heavy" is not a property of aluminium.

**Final Answer**: C. Heavy

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